So I've interested read the release notes of DragonflyBSD, who shows that tmpfs are ported from NetBSD to that FreeBSD (4.8) based operating system: www(dot)dragonflybsd(dot)org/release26/

Wikipedia means, that in October 1995, OpenBSD forked as a new project from NetBSD (1.0).

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Questions:
Is anybody out there, who run tmpfs under OpenBSD? And if not, are there plans to port tmpfs to that platform, like DragonflyBSD did it before? The distant relationship from OpenBSD to NetBSD should make that not too difficult, or am I on the wrong tack?

You might pose this question on the misc@ mailing list, but be sure it does not appear that you are asking or demanding the developers add such a feature. At worse, feature requests are ignored; at the very worse, you will possibly receive a stream of very unpleasant responses.

In general, the OpenBSD developers are most open to people submitting diffs of work which either corrects or extends current functionality. The specific target demographic of the project is the project developers themselves. The rest of us are lucky they make their work freely available to the public.